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3 Sheets-#Sheeit -1.

(No Model.)

S. MOGLELLAN.

BIT BRAGE Patented June 29,1897.

\ (No Model.) 3 Sheets-Sheet 2. s. McGLELLAN. 1

BIT BRAGB.

No. 585,531. Patented June 29,1897.

m mm- (No Model.) 3 Sheets-Sheet3 S. MOGLELLAN.

BIT BRAGB.

No. 585,531. Patented June 29,1897.

taken on the line 8 8 of Fig. 9.

NITED STATES PATENT .Fmcn.

STEPHEN MOOLELLAN, OF SAN MARCOS, TEXAS, ASSIGNOR OF TW'O-THIRDS TOTHOMAS H. YVHELESS, OF AUSTIN, TEXAS, AND DENIS NUNAN, OF

NEWV YORK, N. Y.

BlT-BRAC E.

SPECIFICATION forming part of Letters Patent No. 585,531, dated J Line29, 1897.

. Application filed March 20, 1897- Serial No. 628,474. (No model.)

To all whom it may concern-.-

Be it known that l, STEPHEN MOGLELLAN, a citizen of the United States,residing at San Marcos, in the county of Hays and State of Texas, haveinvented certain new and useful Improvements in Bit-Braces and I dohereby declare the following to be a full, clear, and exact descriptionof the invention, such as will enable others skilled in the art to whichit appertains to make and use the same.

This invention relates to improvements in bit-braces; and it consists inan improved form of brace having a V- guide which is substantiallyright-angled and mechanism mounted therein for driving a bit so arrangedthat the crank-arm of the handle may turn in a corner without strikingthe wall or without striking a plane support should the guide restthereon when boring a hole.

The brace is so constructed that it may be used in boring a hole in acorner up or down, right or left, by simply turning the handcrank, or itmay be used in boring a hole on a line parallel to a base on which theguide rests, or it may be used in combination with a removablebreast-rest, as with an ordinary brace.

Figure 1 represents a central longitudinal section of the preferred formof my machine with the removable breast-rest in place. Fig. 2 representsan end elevation of the same with the breast-rest attached to the handleand extending at right angles to the central line of the device. Fig. 3represents a side elevation of the device, parts being broken away. Fig.4 represents a side elevation of my machine, with a detachable extensionof the main shaft carrying the handle to enable the device to be usedbetween beams or in other openings, showing also the removablebreast-rest secured in a vertical position. Fig. 5 represents ahorizontal section taken on the line 5 5 of Fig. 2. Fig. 6 is an endview of the breast-rest, showing the adjustable restplate thereon. Fig.7 is a perspective view showing modification of the handle. Fig. 8 is atransverse sectional view of the same, Fig. 9 is a fied form ofbreast-rest.

tive view of the form of breast-rest shown in Fig. 9.

A represents a casting or guide having the forward portion A thereofbored out, as at Ct, to receive the journal B, carrying the chuck O.This casting is provided with inclined side walls A preferably at, ornearly at, right angles to each other and may have their lower edges cutoff to form a plane A on which the instrument can be supported or guidedin boring. ThetwosidesAiwiththebase-plane A form a I- shaped guideadapted to fit snugly in the corners of walls, cabinets, or the like,whereby the tool may be steadied in use, or the base A or either of thesides A maybe caused to rest on the floor or against a wall orpartition, whereby the tool may be steadied in use and a straighter holebored. The rear end of the guide-frame is preferably made solid, as at Aand extends upward and rearward to form the j ournal-bearing Aperforated, as at a to receive the driving-spindle E, or this arm orextension A may be detachably connected to the frame or hinged to adjustit to any angle, ifdesired.

The driving-spindle E is preferably provided with the head E, adapted toreceive the sliding arm F of the hand-crank, which is rotated by meansof the handle F. This hand-crank F is preferably grooved, as at f, toengage the end of the set-screw or clamp e, and by means of this clampthe handle is maintained in the proper position, projecting outward, andalso the length of the crank-arm may be shortened or lengthened at will,whereby a greaterleverage at decreased speed or a lesser leverage atincreased speed may be obtained.

The driving-spindle E may be connected to the journal B by means of auniversal joint D, as shown, or by means of a bevelgear, or in any otherconvenient way in which the motion of the spindle E may be imparted tohandle may be castintegrally with the frame, if desired, or it may besecured thereto in any other desired way.

To enable the operator to steady the device and hold the same morefirmly, a removable breast-rest, such as shown in Figs. 1 and 4, may beused. This breast-rest consists of a curved plate K, slottedlongitudinally, as at 70, and recessed around the slot 70 on the concaveor outer side, as at it, to receive the square head K on the end of therod K This rod K is screw-threaded on the end adjacent to the head K,and a milled nut k is placed on the threaded portion thereof, afterwhich the end of the rod is passed through the slot is in the rest-plateK, and the head K is rigidly secured thereto in any wellknown manner.Thus the rest-plate K is adjustable transversely on the rod K within thelimits of the slot 70, and may be clamped securely at any positionwithin the said limit's by the milled nut W, as will be readilyunderstood. Near the other end of the rod K is rigidly secured a lug oroffset K which is perforated near its outer end to receive a threadedbolt K*, which bolt is free to slide through the perforation in the saidlug K The outer end of the bolt is hooked, as at 7%, and a milled nut 70is screwed upon the threaded end thereof to bear upon the lug K for apurpose to be hereinafter explained.

The solid end of the frame A is perforated,

as at a and rovided with a slot a 0 en between the edges A as shown inFig. 2. To attach the breast-rest, as shown in Fig. 1, the milled nut kis turned to move along the bolt K away from the lug K The outer end ofthe bolt is then placed in the slot d with the hook k inside of theframe A. The end 76 of the rod K projecting through the lug K is placedin the perforation a and the milled nut k is then screwed down upon thelug K binding the hook against the inner end of the frame A, thusholding the rod and breastrest firmly in the position shown in Fig. 1.

The planes A are preferably at right angles to each other, so that whenthe tool is to be used in a corner the axis of the chuck and boringdevice may be exactly parallel with the two walls forming the corner,and the boring device. may be made to bore a hole exactly parallel withsaid walls, either down in the floor or up in the ceiling or laterallyin either wall, or the tool, if placed flat on the plane A or on eitherof the planes A and held in position, may be made to bore a hole exactlyparallel to the supporting-surface.

It may sometimes be desirable to attach the breast-rest from the sideofthe machine, and for this purpose the arms II of the handle areperforated, as at h, to receive the rod K the said perforations openingthrough slots h into the larger openings h".

The breast-rest is inserted by passing the lug K through the opening 7L2on one side of the handle and passing the reduced part 70 through theslot h, so that the rod K will pass through the perforation h. The end70 of the rod K is then inserted in the perforation h on the other sideof the handle, and the hook end 70 of the bolt K is placed over theright or left edge of the side of the handle in either of the notches77. and the nut screwed down.

as may be required by the nature of the work I in hand, the end 70 beingplaced in one of the perforations onthe lug and the hook 76 on the boltK turned to engage in perforation a as will be readily understood.

In Fig. 4c is shown an attachment which may be placed on the extension Ato lengthen the main shaft E should it be desirable to use the machinebetween beams or in any small opening. The said attachment consists of apiece of metal or bracket M, bent substantially at right angles, as atm, and perforated to receive the shaft E The other end of the piece M issecured to a ring N of suitable size to pass freely over the extension Aof the frame A and adapted to be held thereon by the set-screw n.Smallindentations a are formed in the said extension for the end of thesaid set-screw to hold' in. The shaft E is connected by a universaljoint E (similar to the universal joint D) with a fork E, which isformed of such size as to fit snugly over the head-E on the shaft E. Amilled head-screw e is passed through the said fork E and the opening inthe head E to hold the two firmly together, as shown in Fig. 4.

The upper end of the shaft E is provided with a head E similar to thehead E on the shaft E, and when this attachment is used the crank-arm Fand handle F are removed from the head E and placed in the head E Byreference to Fig. 4 it will be seen that the shaft E extends at rightangles to the axis of the chuck C for holding the boring-bit. In thisinstance the breast-rest would preferably be placed in the verticalposition, as shown in Fig. 4:.

By turning the ring N upon the extension A the shaft E may be caused toextend backward in a line parallel with the axis of the chuck O, or itmay be arranged to extend at an angle on either side, as will be readilyunderstood. I

In Figs. 7 and 8 is shown a modified form of brace in which the sidearms H of the handle H are not perforated to receive the breast-rest.This would probably only be used where it was desirable to produce abrace at small cost.

In Figs. 9 and 10 is shown a simple form of breast-rest consisting of arod K reduced and screw-threaded, as at it where it enters the opening awhich in this instance is ICO IIO

threaded to receive it. Therest proper in this instance consists of acurved plate K rigidly secured to the rod K This form would probablyonly be used in order to cheapen the construction of the tool.

I claim as my invention 1. A bit-brace consisting of a frame, with ajournal-bearing in one end of said frame, an inclined arm with a journal-bearin g therethrough near the other end of said frame, a journaland a shaft mounted in said journalbearings respectively, a universaljoint connecting said journal and said shaft, a chuck carried by thejournal, a bracket detachably connected to said arm, a second shaftjournaled in said bracket, and connected by means of a universal jointto the first shaft and a hand-crank connected to said second shaft, anda breast-rest detachablyconnected to the frame, substantially asdescribed.

2. A detachable breast-rest or handle for use with bit-braces or thelike comprising a rod adapted to fit into one or more perforations inthe bit-brace, an offset projecting from said rod near the front endthereof, and adapted to bear against the surface of the bitbrace whenthe end of the rod is inserted, a hooked-shaped bolt passing throughsaid offset aud revolubly mounted therein and screwthreaded at its outerend, and a nut adapted to screw on said bolt, and a rest-plate or handleat the outer end of said rod, substantially as described.

A detachable breast-rest or handle for use with bit-braces or the likecomprising a rod adapted to fit into one or more perforations in thebit-brace,an offset projecting from said rod near the front end thereof,a hookshaped bolt passing through said offset and screw-threaded at itsouter end, and a nut adapted to screw on said bolt, and an adj ustablerest-plate or handle at the other end of said rod, substantially asdescribed.

'4. A detachable breast-rest or handle for use with bit-braces or thelike, comprising a rod screw-threaded near its rear end and providedwith an angular cap and having its front end adapted to fit into one ormore perforations in the bit-brace frame, an offset projecting from saidrod near the front end thereof, a hook-shaped bolt passing through saidoffset and screw-threaded at its outer end, a milled-headed nut screwingonto said screwthreads, a slotted plate having a groove engaging saidangular cap, and a clamp-screw on said rod adapted to clamp said slottedplate at the desired position relative to said cap, substantially asdescribed.

5. A detachable breast-rest or handle for use with bit-braces or thelike comprising a rod screw-threaded near its rear end and having anangular cap in rear of said screwthreads, means for securing the frontend of said rod to the bit-brace frame, a slotted plate engaging saidrod in front of said cap, and a milled-headed screw adapted to clampsaid plate against said cap, substantially as described.

6. A bit-brace, consisting of a V- shaped guide-frame, with ajournal-bearing in one end of said frame, an inclined arm with a journalbearing therethrough near the other end of said frame, a journaland a shaft mounted in said journal-bearings, respectively, a universaljoint connecting said journal and said shaft, a chuck carried by thejournal, a handcrank connected to said shaft, a handle having slottedarms to receive a breast-rest secured to said frame, and a breast-restdetachably connected to said frame, substantially as described.

7. A bit-brace, consisting of a V- shaped guide-frame,with ajournal-bearin g in one end of said frame, an inclined arm with a journalbearing therethrough near the other end of said frame, a journaland a shaft mounted in said journal-bearings, respectively, a universaljoint connecting said journal and said shaft, a chuck carried by thejournal, a handcrank connected to said shaft, a handle having armsprovided with openings h a slot 71 and a larger slot 7L to receive abreast-rest, and a breast-rest detachably connected to said frame,substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

STEPHEN MCCLELLAN. Witnesses:

S. V. DANIEL, A. A. THOMAS.

